The Shure Wireless Handheld Microphone consists of the SLX wireless handheld transmitter fitted with the SM58 cardioid microphone capsule. The Shure SLX2 Wireless Handheld Transmitter includes timed backlit LCD display, frequency and power lockout, and "Mute" functionality. The SLX2 transmitter design allows for interchangeable microphone cartridges. The Shure SM58 vocal microphone is tuned to accentuate the warmth and clarity of lead and back-up vocals. It is consistently the first choice of performers everywhere.